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It started with the flu in VACCINATION and became a full blown zombie apocalypse in EVACUATION. Find out how the nightmare concludes in PRESERVATION. Former 911 Dispatcher, Chase McKinney, learned that those inoculated with flu shots became zombies; that the US government and military were largely infected, rendering them useless in the crisis; and that he and his family are forced to continue along on a dangerous journey. Crossing into Mexico might provide the only sanctuary from the millions of zombies plaguing America. The question is, could they make it safely from New York to the border ...